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60505db52d
Incorrect Debug Variable Range was calculated while "COMPUTING LIVE DEBUG VARIABLES" stage.
Range for Debug Variable("i") computed according to current state of instructions
inside of basic block. But Register Allocator creates new instructions which were not taken
into account when Live Debug Variables computed. In the result DBG_VALUE instruction for
the "i" variable was put after these newly inserted instructions. This is incorrect.
Debug Value for the loop counter should be inserted before any loop instruction.
Differential Revision: https://reviews.llvm.org/D62650
llvm-svn: 362750
172 lines
9.2 KiB
LLVM
172 lines
9.2 KiB
LLVM
; RUN: llc -O3 -verify-machineinstrs -mtriple=aarch64-none-linux-gnu -print-after virtregrewriter < %s >%t 2>&1 && FileCheck <%t %s
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; This test checks that DBG_VALUE instruction placed correctly.
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; Specifically: if Register Allocator inserts additional instructions
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; in the beginning of basic block then it should not break placement
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; of DBG_VALUE for loop index variable. That DBG_VALUE instruction
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; for "i" variable should be placed before any real loop instruction.
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; https://reviews.llvm.org/D62650
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; Created from the following C source:
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; cat test_debug_val.cpp
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;
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; void func(int, ...);
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;
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; int array[0x100];
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;
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; int main( int argc, char **argv )
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; {
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; int var = 56;
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;
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; int a1 = array[1]; int a2 = array[2]; int a3 = array[3]; int a4 = array[4];
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; int a5 = array[5]; int a6 = array[6]; int a7 = array[7]; int a8 = array[8];
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; int a9 = array[9]; int a10 = array[10];
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;
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; for( int i = 0; i < 0x100; i++ ) {
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;
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; array[i] = var;
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;
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; func(0, i, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10 );
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; }
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;
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; return 0;
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; }
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;
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;
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; clang -O3 -g -c --target=aarch64-unknown-linux -std=gnu++14 test_debug_val.cpp -emit-llvm -S -o -
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; CHECK: bb.2.for.body
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; CHECK-NEXT: predecessors
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; CHECK-NEXT: successors
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; CHECK-NEXT: liveins
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; CHECK-NOT: MOV
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; CHECK: DBG_VALUE $[[REG:[xw][0-9]+]], $noreg, !"i"
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; CHECK: MOV
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; ModuleID = 'test_debug_val.cpp'
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source_filename = "test_debug_val.cpp"
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target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
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target triple = "aarch64-unknown-linux"
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@array = dso_local local_unnamed_addr global [256 x i32] zeroinitializer, align 4, !dbg !0
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; Function Attrs: norecurse
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define dso_local i32 @main(i32 %argc, i8** nocapture readnone %argv) local_unnamed_addr #0 !dbg !14 {
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entry:
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call void @llvm.dbg.value(metadata i32 %argc, metadata !21, metadata !DIExpression()), !dbg !36
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call void @llvm.dbg.value(metadata i8** %argv, metadata !22, metadata !DIExpression()), !dbg !36
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call void @llvm.dbg.value(metadata i32 56, metadata !23, metadata !DIExpression()), !dbg !36
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%0 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 1), align 4, !dbg !37
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call void @llvm.dbg.value(metadata i32 %0, metadata !24, metadata !DIExpression()), !dbg !36
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%1 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 2), align 4, !dbg !42
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call void @llvm.dbg.value(metadata i32 %1, metadata !25, metadata !DIExpression()), !dbg !36
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%2 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 3), align 4, !dbg !43
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call void @llvm.dbg.value(metadata i32 %2, metadata !26, metadata !DIExpression()), !dbg !36
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%3 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 4), align 4, !dbg !44
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call void @llvm.dbg.value(metadata i32 %3, metadata !27, metadata !DIExpression()), !dbg !36
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%4 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 5), align 4, !dbg !45
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call void @llvm.dbg.value(metadata i32 %4, metadata !28, metadata !DIExpression()), !dbg !36
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%5 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 6), align 4, !dbg !46
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call void @llvm.dbg.value(metadata i32 %5, metadata !29, metadata !DIExpression()), !dbg !36
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%6 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 7), align 4, !dbg !47
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call void @llvm.dbg.value(metadata i32 %6, metadata !30, metadata !DIExpression()), !dbg !36
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%7 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 8), align 4, !dbg !48
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call void @llvm.dbg.value(metadata i32 %7, metadata !31, metadata !DIExpression()), !dbg !36
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%8 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 9), align 4, !dbg !49
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call void @llvm.dbg.value(metadata i32 %8, metadata !32, metadata !DIExpression()), !dbg !36
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%9 = load i32, i32* getelementptr inbounds ([256 x i32], [256 x i32]* @array, i64 0, i64 10), align 4, !dbg !50
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call void @llvm.dbg.value(metadata i32 %9, metadata !33, metadata !DIExpression()), !dbg !36
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call void @llvm.dbg.value(metadata i32 0, metadata !34, metadata !DIExpression()), !dbg !51
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br label %for.body, !dbg !52
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for.cond.cleanup: ; preds = %for.body
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ret i32 0, !dbg !53
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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call void @llvm.dbg.value(metadata i64 %indvars.iv, metadata !34, metadata !DIExpression()), !dbg !51
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%arrayidx = getelementptr inbounds [256 x i32], [256 x i32]* @array, i64 0, i64 %indvars.iv, !dbg !54
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store i32 56, i32* %arrayidx, align 4, !dbg !57
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%10 = trunc i64 %indvars.iv to i32, !dbg !58
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tail call void (i32, ...) @_Z4funciz(i32 0, i32 %10, i32 %0, i32 %1, i32 %2, i32 %3, i32 %4, i32 %5, i32 %6, i32 %7, i32 %8, i32 %9), !dbg !58
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !59
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call void @llvm.dbg.value(metadata i32 undef, metadata !34, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !51
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%exitcond = icmp eq i64 %indvars.iv.next, 256, !dbg !60
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br i1 %exitcond, label %for.cond.cleanup, label %for.body, !dbg !52, !llvm.loop !61
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}
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declare dso_local void @_Z4funciz(i32, ...) local_unnamed_addr #1
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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attributes #0 = { nounwind uwtable }
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attributes #1 = { nounwind uwtable }
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attributes #2 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10, !11, !12}
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!llvm.ident = !{!13}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "array", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
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!3 = !DIFile(filename: "test_debug_val.cpp", directory: "")
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!4 = !{}
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!5 = !{!0}
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!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 8192, elements: !8)
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!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!8 = !{!9}
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!9 = !DISubrange(count: 256)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"wchar_size", i32 4}
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!13 = !{!"clang version 9.0.0 "}
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!14 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 6, type: !15, scopeLine: 7, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !20)
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!15 = !DISubroutineType(types: !16)
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!16 = !{!7, !7, !17}
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!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !18, size: 64)
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!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
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!19 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_unsigned_char)
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!20 = !{!21, !22, !23, !24, !25, !26, !27, !28, !29, !30, !31, !32, !33, !34}
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!21 = !DILocalVariable(name: "argc", arg: 1, scope: !14, file: !3, line: 6, type: !7)
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!22 = !DILocalVariable(name: "argv", arg: 2, scope: !14, file: !3, line: 6, type: !17)
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!23 = !DILocalVariable(name: "var", scope: !14, file: !3, line: 8, type: !7)
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!24 = !DILocalVariable(name: "a1", scope: !14, file: !3, line: 10, type: !7)
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!25 = !DILocalVariable(name: "a2", scope: !14, file: !3, line: 10, type: !7)
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!26 = !DILocalVariable(name: "a3", scope: !14, file: !3, line: 10, type: !7)
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!27 = !DILocalVariable(name: "a4", scope: !14, file: !3, line: 10, type: !7)
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!28 = !DILocalVariable(name: "a5", scope: !14, file: !3, line: 11, type: !7)
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!29 = !DILocalVariable(name: "a6", scope: !14, file: !3, line: 11, type: !7)
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!30 = !DILocalVariable(name: "a7", scope: !14, file: !3, line: 11, type: !7)
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!31 = !DILocalVariable(name: "a8", scope: !14, file: !3, line: 11, type: !7)
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!32 = !DILocalVariable(name: "a9", scope: !14, file: !3, line: 12, type: !7)
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!33 = !DILocalVariable(name: "a10", scope: !14, file: !3, line: 12, type: !7)
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!34 = !DILocalVariable(name: "i", scope: !35, file: !3, line: 14, type: !7)
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!35 = distinct !DILexicalBlock(scope: !14, file: !3, line: 14, column: 4)
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!36 = !DILocation(line: 0, scope: !14)
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!37 = !DILocation(line: 10, column: 13, scope: !14)
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!42 = !DILocation(line: 10, column: 32, scope: !14)
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!43 = !DILocation(line: 10, column: 51, scope: !14)
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!44 = !DILocation(line: 10, column: 70, scope: !14)
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!45 = !DILocation(line: 11, column: 13, scope: !14)
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!46 = !DILocation(line: 11, column: 32, scope: !14)
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!47 = !DILocation(line: 11, column: 51, scope: !14)
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!48 = !DILocation(line: 11, column: 70, scope: !14)
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!49 = !DILocation(line: 12, column: 13, scope: !14)
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!50 = !DILocation(line: 12, column: 33, scope: !14)
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!51 = !DILocation(line: 0, scope: !35)
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!52 = !DILocation(line: 14, column: 4, scope: !35)
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!53 = !DILocation(line: 21, column: 4, scope: !14)
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!54 = !DILocation(line: 16, column: 8, scope: !55)
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!55 = distinct !DILexicalBlock(scope: !56, file: !3, line: 14, column: 37)
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!56 = distinct !DILexicalBlock(scope: !35, file: !3, line: 14, column: 4)
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!57 = !DILocation(line: 16, column: 17, scope: !55)
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!58 = !DILocation(line: 18, column: 8, scope: !55)
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!59 = !DILocation(line: 14, column: 32, scope: !56)
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!60 = !DILocation(line: 14, column: 22, scope: !56)
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!61 = distinct !{!61, !52, !62}
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!62 = !DILocation(line: 19, column: 4, scope: !35)
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